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Secondary battery and method for charging and discharging secondary battery

a secondary battery and battery technology, applied in the direction of batteries, non-aqueous electrolyte cells, sustainable manufacturing/processing, etc., can solve the problems of difficult situation to achieve a secondary battery with stable and excellent cycle characteristics, low cost, and low cost. , to achieve the effect of high charge-discharge efficiency, high capacity density and stable repeating

Active Publication Date: 2015-09-17
MURATA MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a secondary battery and a method of charging and discharging it. The technical effect of this invention is that by using a low-molecular-weight multi-electron organic compound as the main component of the electrode active material and a sulfone compound as the solvent, the charge-discharge reaction is stabilized and the secondary battery has improved cycle characteristics. The resultant secondary battery has low environmental burden and excellent safety. The method of charging and discharging the secondary battery allows for a stable treatment and creates a battery with excellent cycle characteristics.

Problems solved by technology

In the document 1, although the two-electron reaction is initiated by using the rubeanic acid having a dithione structure, when a low-molecular-weight compound such as a rubeanic acid is used, dissolution in an electrolyte solution or contamination of the electrode due to a dissolved compound easily occurs, as described above, and therefore the battery lacks the stability for repeated charge and discharge.
Therefore, the movement of ions is interfered with and the proportion of the active material to be used effectively is reduced.
In the document 2 and the document 3, although a sulfur-based compound is used for the positive electrode active material and an electrolyte solution having sulfolane, dioxolan or the like used as the solvent is prepared, and thereby a battery is formed, it is in a difficult situation to attain a secondary battery having stable and excellent cycle characteristics even though using such an electrolyte solution.
Although as described above, a secondary battery is prepared by combined use of an organic compound and an electrolyte respectively indicated in the prior art, it is not yet possible to achieve a long-life secondary battery which has adequately high energy density and high output, and has excellent cycle characteristics.

Method used

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  • Secondary battery and method for charging and discharging secondary battery
  • Secondary battery and method for charging and discharging secondary battery
  • Secondary battery and method for charging and discharging secondary battery

Examples

Experimental program
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Effect test

example 1

Preparation of Battery Cell

[0109]As a material for an active material, a rubeanic acid represented by the chemical formula (2a) was prepared, and sulfolane represented by the chemical formula (1a) was prepared as a solvent of an electrolyte solution.

[0110]Then, 300 mg of the rubeanic acid, 600 mg of graphite powder as a conductive material, and 100 mg of polytetrafluoroethylene resin as a binder were respectively weighed, and these weighed materials were kneaded while being uniformly mixed as a whole to obtain a mixture.

[0111]Subsequently, the mixture was pressure-formed to prepare a sheet-shaped member having a thickness of about 150 μm. Then, the sheet-shaped member was dried at 70° C. for 1 hour in vacuum, and then punched out into a round shape with a diameter of 12 mm to prepare a positive electrode active material containing the rubeanic acid as a main component.

[0112]Next, LiN(C2F5SO2)2 (electrolyte salt) having a mole concentration of 1.0 mol / L was dissolved in sulfolane to ...

example 2

Preparation of Battery Cell

[0140]A battery cell was prepared by following the same method / procedure as in Example 1 except for using, as a solvent for an electrolyte solution, ethyl isopropyl sulfone represented by a chemical formula (Ig) in place of sulfolane.

[0141]Check of Operation of Battery Cell

[0142]The battery cell was charged and discharged in the same conditions as in Example 1 and their operation was checked.

[0143]FIG. 7 shows charge and discharge curves at the time when the second time of charge and discharge, in which the charge and discharge characteristic is stabilized, was performed. The horizontal axis indicates a capacity density (Ah / kg) and the vertical axis indicates a voltage (V).

[0144]As is apparent from FIG. 7, it was verified that the battery is a secondary battery which has plateaus at two locations where charge and discharge voltages are 2.2 V and 2.4 V and has a discharge capacity of about 600 Ah / kg in terms of a capacity density.

[0145]FIG. 8 shows cycle ch...

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Abstract

A secondary battery that has an electrode active material mainly composed of a low-molecular-weight multi-electron organic compound that has two or more electrons to be involved in a battery electrode reaction, and a solvent for an electrolyte solution that contains a sulfone compound. Apart of the electrode active material is dissolved in and reacted with the electrolyte solution at the first charge and discharge, thereby oligomerizing a part of the electrode active material.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation application of international patent application Serial No. PCT / JP2013 / 079998 filed 6 Nov. 2013, which published as PCT Publication No. WO2014 / 073560 on 15 May 2014, which claims benefit of Japan patent application No. 2012-247699 filed 9 Nov. 2012, the entire content of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to a secondary battery and a method for charging and discharging a secondary battery, and more particularly relates to a secondary battery which has an electrode active material mainly composed of a multi-electron organic compound and repeats charge and discharge by using a battery electrode reaction of the electrode active material, and a method for charging and discharging the secondary battery.BACKGROUND OF THE INVENTION[0003]With the market expansion of mobile electronic devices such as cellular phones, laptop personal computers and di...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/44H01M10/0525
CPCH01M10/0569H01M10/0525H01M2300/0028H01M2220/30H01M10/44H01M4/0447H01M4/137H01M4/1399H01M4/602H01M10/052Y02E60/10Y02P70/50
Inventor ONOUE, TOMOAKISATO, MASAHARUKOKUBU, EIJICHIBA, KAZUMIYANADA, KAZATOKIRYU, TOSHIYUKITAKADA, TERUHISAMOKUDAI, HIDEHISASUKIGARA, TORU
Owner MURATA MFG CO LTD
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